CN101220592A

CN101220592A - Construction method of concrete pile

Info

Publication number: CN101220592A
Application number: CNA2008100091876A
Authority: CN
Inventors: 王继忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-02-04
Filing date: 2008-02-04
Publication date: 2008-07-16

Abstract

The invention aims at providing a construction method of a concrete pile. An inner tamping pipe fills materials to tamp continuously outside the bottom end of an outer pipe. The filled materials are dispersed materials, thus effectively forming a composite carrier, fully arousing pile end soil to take part in force and greatly raising the bearing ability of the pile. The construction method comprises the following procedures: 1) the outer pipe is led to be sheathed and overlapped with the inner tamping pipe at the pile position; 2) the outer pipe and the inner ramming pipe are struck to be plunged downwards into the designed depth by a diesel hammer; 3) the inner tamping pipe is stuck to be from the bottom end of the outer pipe for a certain distance by the diesel hammer; 4) dispersed materials is filled into the bottom end of the of the outer pipe; the filled dispersed materials is struck by the diesel hammer to the inner tamping pipe; filling materials and tamping repeatedly are carried out until the optimal squeezed dense soil is formed, thus meeting the demand of the ten-strike penetration degree designed value; 5) concrete with stiff consistency is filled to the bottom end of the outer pipe in division order and tamping is carried out by the diesel hammer for striking the inner tamping pipe; 6) construction is executed to a pile body.

Description

The job practices of concrete pile

Technical field

The present invention relates to field of civil engineering, particularly relate to the construction technology of stake.

Background technology

Compaction pile is a kind of the type that China adopts at present, its adopt the mode that expands of ramming (once, secondary, repeatedly ram expand etc.) hold cast-in-situ concrete to expand into Large head type stake, the loaded area of stake end is strengthened, thereby promotes end resistance.But compaction pile also exists some shortcomings and limitation, is difficult to guarantee and determines such as the beginning of enlarged footing, is water-bearing concreae owing to ram what expand, and is squeezed in interior pipe, so there is certain difficulty when squeezed.Especially compaction pile is that a loaded area of holding with the increase stake is a purpose, when squeezed water-bearing concreae, though also can produce some compacted to bearing course at pile end, but DeGrain, not giving full play to the stake end soil body on every side participates in stressed, though therefore the supporting capacity of stake has raising but do not have essence to change, when having better bearing stratum and bearing capacity of single pile to have relatively high expectations for the soil layer superficial part, compaction pile does not have application advantage.

Summary of the invention

The present invention proposes in order to solve the above problems, purpose is to provide a kind of job practices of concrete pile, take the outside of inner tamping tube bottom at the bottom of outer tube to carry out continuous filling tamped, inserts is discrete material but not water-bearing concreae, thereby effectively form complex carrier, it is stressed to give full play to the participation of the stake end soil body, and the supporting capacity of stake is significantly improved.

To achieve these goals, the job practices of concrete pile of the present invention comprises the steps:

1) place, predetermined stake position in ground is with outer tube and inner tamping tube intussusception;

2) impact above-mentioned outer tube and inner tamping tube simultaneously by diesel hammer, make outer tube and inner tamping tube simultaneously to being lowered into, until the projected depth of stake;

3) impact inner tamping tube by above-mentioned diesel hammer, inner tamping tube is hit outer tube bottom certain distance;

4) propose above-mentioned inner tamping tube, insert the prose style free from parallelism inserts of some to the outer tube bottom, impact inner tamping tube by diesel hammer then, the prose style free from parallelism inserts of inserting is tamped by outer tube; Carry out this filling repeatedly and impact the compacting operation, to the outer tube bottom, promptly the certain depth of stake end below and the foundation soil body of scope carry out closely knit reinforcing, hit the pile penetration design load until satisfying ten, form the compacted soil body of the optimum of necessary requirement;

5) by above-mentioned outer tube, the harsh concrete to outer tube bottom gradation filling scheduled volume impacts inner tamping tube by diesel hammer, and harsh concrete is tamped;

6) carry out the construction of pile body.

Best, in the job practices of above-mentioned concrete pile, above-mentioned steps 1) external diameter of inner tamping tube is less than the internal diameter of casing in, and should in the bottom sealing of pipe, the bottom is the flat or sharp end.

Best, in the job practices of above-mentioned concrete pile, above-mentioned steps 1) in during,, identical at inner tamping tube upper ends diameter, highly be the neck ring that adds of 100～250mm with outer tube diameter according to the soil property situation with outer tube and inner tamping tube intussusception.

Best, in the job practices of above-mentioned concrete pile, above-mentioned steps 4) inner tamping tube is to realize under the situation of the outside certain distance in outer tube bottom by inner tamping tube to the compacting that the prose style free from parallelism inserts of inserting carries out in.

Best, in the job practices of above-mentioned concrete pile, above-mentioned steps 4) the compacted soil body that satisfies the optimum of necessary requirement in is meant and meets following condition a), side by side primary surface does not swell, the established compacted soil body of adjacent studs is not impacted, thereby form by the prose style free from parallelism inserts of tamping at the stake end, the compacted soil body and the carrier that influences soil body formation obtain the maximum diffusion area Ae that stake is held thus, to obtain the supporting capacity of maximum; The final filling compacting degree that this condition a) refers to above-mentioned inserts is hit the control of injection amount by ten, promptly under situation about not feeding intake, makes a call to the ten injection amounts of hitting so that predetermined energy test hammer ram is empty continuously, and above-mentioned ten hit total injection amount should be less than design load.

Best, in the job practices of above-mentioned concrete pile, above-mentioned steps 4) middle prose style free from parallelism inserts refers to mashed watt of brickbat or harsh concrete or various discarded aggregate or cobble or slag, or the compound of above-mentioned material.

Best, in the job practices of above-mentioned concrete pile, above-mentioned steps 6) construction of pile body is meant in, propose earlier in outer tube, to place reinforcing cage behind the inner tamping tube, the required concrete of perfusion pile body in outer tube is pressed in inner tamping tube on the outer tube inner concrete face then again, and the limit flanging slowly rises pulls out outer tube, with the two-tube face of land of extracting synchronously, finish the construction of pile body at last.

Best, in the job practices of above-mentioned concrete pile, above-mentioned steps 6) construction of pile body comprises the precast concrete pile body in.

The characteristics and the advantage of the concrete pile that forms by above method are:

1. Zhuan bearing capacity height.General relatively compaction pile, owing to form effective complex carrier at the stake end, quite with the deep layer composite foundation, a settling amount that significantly improves the bearing capacity of stake and reduce.

2. shorten the length of stake.With respect to general compaction pile, stake end complex carrier can be established the soil layer relatively preferably of superficial part in the ground, therefore can effectively shorten the length of stake.

3. improve work efficiency, ensure the quality of products.Because inserts is prose style free from parallelism inserts, and the compacting process is to carry out in the outside of outer tube bottom, and with respect to the general squeezed concrete in outer tube that compaction pile adopted, it is convenient more easily to construct.Under the deadweight effect of diesel hammer and inner tamping tube, the easier densification moulding of pile concrete guarantees pile quality simultaneously.Also can adopt precast pile simultaneously.

Description of drawings

Fig. 1 is as the process chart of the job practices of the concrete pile of one embodiment of the present of invention.

The specific embodiment

Job practices as the concrete pile of one embodiment of the present of invention, it comprises the steps, at first, as shown in Figure 1a, inner tamping tube 2 is gone into intussusception in the outer tube 1 by place, predetermined stake position in ground, and adopts fastening devices 3 that outer tube 1 is fixing with inner tamping tube 2, impact inner tamping tube 2 by diesel hammer 4 again, make inner tamping tube 2 and outer tube 1 simultaneously to being lowered into; Then, shown in Fig. 1 b,, make inner tamping tube 2 and outer tube 1 sink to design elevation simultaneously, after the dismounting fastening devices 3, inner tamping tube 2 is hit outer tube 1 bottom certain distance by diesel hammer by constantly impacting of diesel hammer 4; Then, shown in Fig. 1 c, propose inner tamping tube 2, in outer tube 1, insert prose style free from parallelism inserts 5; Shown in Fig. 1 d, impact inner tamping tube 2 then, the prose style free from parallelism inserts of inserting 5 is tamped by diesel hammer; Then, shown in Fig. 1 e, carry out this filling repeatedly and impact the compacting operation, to the bottom of outer tube 1, promptly the foundation soil body of certain depth, scope and volume carries out closely knit reinforcing under the stake end; Then, shown in Fig. 1 f, form the supporting body satisfy necessary requirement, this supporting body is by the prose style free from parallelism inserts 5 of compacting, the compacted the soil body 6 and influence soil body 7 formations; Then, shown in Fig. 1 g, fill the harsh concrete 8 of scheduled volume to the gradation of outer tube bottom, impact inner tamping tube 2, harsh concrete 8 is rammed to expand the outer tube bottom by diesel hammer by outer tube 1; Then, shown in Fig. 1 h, descending reinforcing cage 9 in outer tube 1, and concrete perfusion 10 in outer tube 1, concrete 10 is carried out the densification moulding after, outer tube 1 and inner tamping tube 2 are proposed, finish the pile body construction.

Claims

1. the job practices of a concrete pile, this method comprises the steps:

6) carry out the construction of pile body.

2. the job practices of concrete pile according to claim 1 is characterized in that above-mentioned steps 1) in, the external diameter of above-mentioned inner tamping tube is less than the internal diameter of casing, and the bottom of pipe is sealed in being somebody's turn to do, and the bottom is the flat or sharp end.

3. the job practices of concrete pile according to claim 1, it is characterized in that above-mentioned steps 1) in, above-mentioned during with outer tube and inner tamping tube intussusception, according to the soil property situation, identical at inner tamping tube upper ends diameter, highly be the neck ring that adds of 100～250mm with outer tube diameter.

4. the job practices of concrete pile according to claim 1 is characterized in that above-mentioned steps 4) in, above-mentioned inner tamping tube is to realize under the situation of the outside certain distance in outer tube bottom by inner tamping tube to the compacting that the prose style free from parallelism inserts of inserting carries out.

5. job practices according to claim 1, it is characterized in that above-mentioned steps 4) in, the above-mentioned compacted soil body that satisfies the optimum of necessary requirement is meant and meets following condition a), side by side primary surface does not swell, the established compacted soil body of adjacent studs is not impacted, thereby form by the prose style free from parallelism inserts of tamping at the stake end, the compacted soil body and the carrier that influences soil body formation obtain the maximum diffusion area Ae that stake is held thus, to obtain the supporting capacity of maximum; The final filling compacting degree that this condition a) refers to above-mentioned inserts is hit the control of injection amount by ten, promptly under situation about not feeding intake, makes a call to the ten injection amounts of hitting so that predetermined energy test hammer ram is empty continuously, and above-mentioned ten hit total injection amount should be less than design load.

6. job practices according to claim 1 is characterized in that above-mentioned steps 4) in, above-mentioned prose style free from parallelism inserts refers to mashed watt of brickbat or harsh concrete or various discarded aggregate or cobble or slag, or the compound of above-mentioned material.

7. job practices according to claim 1, it is characterized in that above-mentioned steps 6) in, the construction of above-mentioned pile body is meant, propose earlier in outer tube, to place reinforcing cage behind the inner tamping tube, the required concrete of perfusion pile body in outer tube is pressed in inner tamping tube on the outer tube inner concrete face then again, and the limit flanging slowly rises pulls out outer tube, with the two-tube face of land of extracting synchronously, finish the construction of pile body at last.

8. job practices according to claim 1 is characterized in that above-mentioned steps 6) in, the construction of above-mentioned pile body comprises the precast concrete pile body.